Clean up `logger = logging.getLogger(__name__)`

[justinxzhao]

trafficstars

There are vestiges of a mechanism that was introduced to Ludwig to workaround an issue with tensorflow's logging:

import logging

logger = logging.getLogger(__name__)

...

logger.info()

In torch, these should be able to be replaced with out-of-the-box logging:

import logging

logging.info()